The Holland Land Company was an unincorporated syndicate of thirteen Dutch investors from Amsterdam, headquartered in Philadelphia, who purchased large tracts of American land for development and speculation. Their primary purchase was that of the western two-thirds of the Phelps and Gorham Purchase in 1792 and 1793, an area that afterward was known as the Holland Purchase. Additional lands were purchased in northwest Pennsylvania. Aliens were forbidden from owning land within New York State, except by special acts of the New York State Legislature, so investors placed their funds in the hands of certain trustees who bought the land in central and western New York State. The syndicate hoped to sell the land rapidly at a great profit. Instead, for many years they were forced to make further investments in their purchase; surveying it, building roads, digging canals, to make it more attractive to settlers. They influenced state policy in New York to allow foreign ownership of the land, avoid new taxes, and promote the construction of the Erie Canal and government roads on the company lands. They supported Governor Dewitt Clinton's faction in the state government to achieve these goals. The company finished selling its New York lands in 1839 and its Pennsylvania lands in 1849, and the company was liquidated in 1858.

The Phelps and Gorham Purchase was the forced sale, in 1788, of a portion of a large tract of land in western New York State owned by the Seneca nation of the Iroquois Confederacy to a syndicate of land developers led by Oliver Phelps and Nathaniel Gorham. The larger tract of land is generally known as the "Genesee tract" and roughly encompasses all that portion of New York State west of Seneca Lake, consisting of about 6,000,000 acres (24,000 km2).